Chicago Wilderness
Citizens for Conservation
Fox River Ecosystem Partnership
HomeGrown National Park
Illinois Audubon Society
Illinois State Museum Research
Openlands
The Conservation Foundation
Wild Ones
Wisconsin Wetlands

Historical Land Surveyor Records of Illinois
How to Plant Trees
Illinois Master Gardeners
Plants that Attract Native Bees
The Bee Spotter

Green Roofs for Healthy Cities

Midwest Invasive Plant Network
Northeast Illinois Invasive Plant Partnership

Cook County Forest Preserve District
DeKalb County Forest Preserve District
Forest Preserve District of DuPage County
Forest Preserve District of Kane County
Forest Preserve District of Will County
Kendall County Forest Preserve District
Lake County Forest Preserve District
McHenry County Conservation District
Observe your Preserve

Chicago Botanic Garden
Missouri Botanical Garden Plant Finder
The Lurie Garden
The Morton Arboretum
University of Michigan Herbarium

Illinois Audubon Society
Illinois DNR
Illinois Wildflowers
Indiana Native Plant and Wildflower Society